Process of manufacturing white lead.



No. 785,023. I PATENTED MAR. 14, 1905. w. H. ROWLBY & J. H. MONTGOMERY.-

PROCESS OF MANUFACTURING WHITE LEA-D.

- APPLIOATION FILED AUG. 5, 1901.

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@MW' W N0.-7s5,02s. v PATBNIED MAR.'14, 1905. W. H. RO'WLBY as: J;' HLMONTGOMERY.

PROCESS OF MANUFACTURING WHITE LEAD.

- APPLICATION FILED AUG. 5, 1901.

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UNITED STATES Patented March 14, 1905.

PATENT OFFICE.

WVILIISON H. ROVVLEY AND JOHN H. MONTGOMERY, OF ST. LOUIS, MISSOURI, ASSIGNORS OF ONE-THIRD TO MARTIN SHAUGHNESSY,

OF ST. LOUIS, MISSOURI.

PROCESS OF MANUFACTURING WHITE LEAD.

SPECIFICATION forming part of Letters Patent No. 785,023, dated March 14, 1905.

Application filed August 5, 1901. Serial No. 70,904.

'cost of same.

Figure 1 is a view of our improved appa ratus by which the white lead is manufactured. Fig. 2 is a vertical section of a receptacle into which the atomized lead is forced.

Fig. 3 is an enlarged detail view of the airchamber surrounding the end of the pipe through which the lead flows and also shows the air-inlets leading to the air-chamber.

- In manufacturing white lead by our improved process the lead is first melted in a kettle 1, which is mounted over afurnace 2, conveniently located for the purposes of our invention. A conducting-pipe 3 leads from the lower end of the kettle 1 and extends into a receptacle 4:. An air-chamber 5 surrounds the end of the pipe 3, and air-pipes 6 lead through the furnace under the kettle 1 into the said air-chamber 5, and the air is heated as it passes through the said pipes and is forced into the air-chamber. An opening 7 is formed through the air-chamber 5 around the inner end of the nozzle of the pipe 3, through which the heated air is forced to simultaneously atomize and partially oxidize the lead as it pours through the pipe 3. Water-spraying pipes 7 extend across the upper side of the receptacle 4, and the water is sprayed through the said pipes and acts upon the atomized and oxidized lead, causing it to fall to the trough-shaped bottom of the receptacle 4, where it is moved by the carrier 8 to, the outlets 9, formed at one end of the said receptacle 4. The fine particles of oxidized lead are then delivered into the common grinding-mill 10, where they are ground or comminuted by means of the grind ing-disks 11, which remove a portion of the surface oxid from the oxid-laden particles.

In the form shown we have provided adriveshaft 12, connected by a belt and intermediate gears to the shaft 13, one end of which is rigidly connected to the said lower disk. After being thoroughly ground by the disk 11 the oxidized lead and water are delivered out of the receptacle into an agitating chamber or receptacle let. The lead is, as before described, first partially'oxidized by the action of the heated air as it leaves the mouth of the nozzle in the air-chamber 5, and the water entering the room or receptacle 4. creates a moisture therein, which assists further oxidization of the lead. The suboxid-laden particles of lead are further oxidized in their course through the grinding-disks, and the residual metallic lead, if any, isthen separated by precipitation, and the comminuted suboxid of lead may be conveyed to a rotary receptacle 15, where it is subjected to air and carbonic-acid gas to form a carbonate of lead, commonly known as white lead. The Water carrying the suboxid of lead is delivered from the receptacle 14 to the receptacle 15 through pipes 16, through which the liquid is forced by the operation of the pump 17. A pipe 18 extends from the pipe 16 over the upper end of the receptacle 10, so that the lead may be delivered again into the said receptacle to be further comminuted by the operation of the disk 11. Valves 19 control these pipes, so that the lead-carrying liquid may be deflected and driven in either direction.

A large amount of the lead is oxidized as it leaves the end of the pipe 3, and the process is continuous until the suboxid has passed through the rotary disks 11. The oxidation is continuous, and the moisture continually acts on the fine particles during their passage through the different stages. Thelead which has not been thoroughly comminuted may be returned through the pipe 18 for further action by the disks 11. If the lead is thoroughly comminuted and oxidized, it will not benecessary to convey the suboxid to the receptacle 15 except for carbonation. The oxidation, be-

ginning with the emission of the lead from the pipe 8, is continuous throughout the several stages described, all parts assisting in furthering the oxidation.

We claim- 1. The within-described steps in the process of making White lead, consisting in first melting the lead, then simultaneously atomizing and oxidizing the molten lead, and thereby producing oxid-laden particles, then subjecting said oxid-laden particles to the oxidizing action of moisture in a closed chamber, and finally precipitating said particles Within said chamber, by the action of jets of water, substantially as specified.

2. The Within-described steps in the process of making White lead, consisting in first melting the lead, then simultaneously atomizing and oxidizing the molten lead, and thereby producing oxid-laden particles, then subjecting said oxid-laden particles to the oxidizing action of moisture in a closed chamber, precipitating said particles within said chamber, by the action of jets of Water, and finally reducing said oxid-laden particles by grinding the same, substantially as specified.

3. The pr cess of making white lead, consisting of first melting the lead, then simultaneously atomizing and oxidizing the molten lead, and thereby producing oxid-laden particles, then subjecting said oxid-laden particles to the oxidizing action of moisture in a closed chamber, precipitating said particles Within said chamber, by the action of jets of Water, reducing said oxid-laden particles by grinding the same then stirring the liquid to prevent settling, and finally subjecting the material to the action of carbonic-acid gas and air to produge carbonate of lead, substantially as specifie 4E. The steps in the process of making White lead, consisting in first melting the lead; secondly, simultaneously atomizing and oxidizing the molten lead and thereby producing oxid laden particles; thirdly, precipitating said particles by the action of jets of water; fourthly, agitating the liquid to prevent settling of said particles; and finally reducing said oxid-laden particles by grinding the oxid therefrom in a grinding-mill, substantially as specified.

5. The process of making white lead, consisting in first melting the lead; secondly, simultaneously atomizing and oxiding the molten lead and thereby producing oxid-laden particles; thirdly, precipitating said particles by the action of jets of Water; fourthly, agitating the liquid to prevent settling of said particles; fifthly, reducing said oxidladen particles by grinding the oxid therefrom in a grinding-mill, and finally subjecting the material to the action of carbonic-acid gas and air, to produce carbonate of lead, substantially as specified.

In testimony whereof We afiix our signatures in presence of two Witnesses.

'WILLSON H. ROWLEY. JOHN H. MONTGOMERY. Witnesses:

ALFRED A. EICKS, JOHN D. RIPPEY. 

